PDF malware analysis — malicious · 1fd84a4ee23f6696

MALICIOUS

PDF

88.3 KB Created: 2021-08-17 08:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: 22b83ab524720a433b748c4bd89de349 SHA-1: 23ada0102afcf9e1c37c61b7a3d31302b22f30fd SHA-256: 1fd84a4ee23f6696b428e48c13c2f5ed94ffd7191bcdff0f1d87a96579c9d65a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or use UTM parameters, suggesting a phishing or malware distribution campaign. The document's structure indicates it functions as a link farm designed to redirect users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://catamma.ru/uplcv?utm_term=mass+and+weight+worksheet+6th+grade PDF link annotation
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ff84554299d---vanogemoso.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d1dbce75---76609309640.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6a0d57b1---6018985667.pdfIn PDF document text
- https://aicpwdosaeast.com/ckfinder/userfiles/files/94671389937.pdfIn PDF document text
- http://fsoa.cn/userfiles/file/nuzufebizitop.pdfIn PDF document text
- https://curvy.tw/upload/files/losixapog.pdfIn PDF document text
- http://marinaxaraes.com.br/ckfinder/userfiles/files/titeliduluwenegozobaza.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec08964b8---wikuwowobe.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1ec6d72965de0a8d2f3cbcf732e3035f/47370244774.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084030027f36---45569198011.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b75aeb4dd9a---nibamamevovudidaxas.pdfIn PDF document text
- https://namratalakhotia.com/userfiles/files/mibazafadeterorowamol.pdfIn PDF document text
- http://svsteinfurth.de/radsportfiles/file/sinomas.pdfIn PDF document text
- https://mk-sito.it/uploads/file/29551159996.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a8cc63a68---58338589829.pdfIn PDF document text
- http://olympusflights.com/files/files/jumiviruzogewut.pdfIn PDF document text
- https://bibliotheque-des-arts.com/ckfinder/userfiles/files/34968559294.pdfIn PDF document text
- http://bacsionline.net/userfiles/file/lasipegatatoxara.pdfIn PDF document text
- http://miraesusan.com/ckupload/files/94757788159.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4c0e1232---nezezowizizofenalarumalo.pdfIn PDF document text
- http://lso-msm.fr/userfiles/file/tonezego.pdfIn PDF document text
- http://allamericannursing.com/userfiles/file/19106992714.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d82880a7b1470c64c8755efd2f734589/23422856313.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01e54b201---52938823642.pdfIn PDF document text
- http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1114fd8e---raxirikawiradibirapik.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vi51ucedkuoh17n187ggtht00f/kimikapawilijul.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f510.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF510	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010d27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D27	10820 bytes
SHA-256: `06492a9568972b843eaead36b6e7c853cdec5f1e540dc205db706bec6aa2f350`
`font_02_sfnt_off000125f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125F3	17028 bytes
SHA-256: `6ed309076bd51428b0d454da7f670f32f0d0af640d906735bf01cbe60bc4dacc`

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